Heating means



Aug. 22, 1939. A. P. WIEGAND HEATING MEANS Filed Nov. 12, 1937 Albn't `P. Wi

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` NYENTOR BYWM/MMMMM/ ATTORNEYS patented A118522. 193e 2,170,175

UNirEp STATES PATENT ori-ics 2,170,175 i nEA'rmG MEANS Albert P. Wiegand, Pittsburgh, Pa., assignor, by mesne assignments, to Edwin L. Wiegand, Pittsburgh, Pa.

Application November 12,1937, serial No. 174,218 4 claims. (o1. 21e-as) This invention relates to heating means, more obvious that each collar 2| closely fits the transparticularly to heating means having'surfaces verse contour of the heating element l2, so that constructed and arranged to facilitate the trans'- substantially all 'surfaces defining the collar are fer of heat from heat-producing means, such as in heat-conducting relation with the adjacent for instance, an electric resistance element, and surface of the heating member I2. One end of 5 the principal object of this invention' is to proeach collar 2| is feathered or tapered to a thin vide new and improved heating means of this edge, as shown at 26, while the other end is type. curved, as at 2l, and extended laterallyT to form In the drawing accompanying this specicaa heat-transfer surface orn 28.

l0 tion, and forming a part of this application, 'I'he coils I6, of the heating member shown, are 10 there is shown, for purposes of illustration, one so connected that the resistance terminals are form which this invention may assume, and in. disposed at one end of the member, and the this drawing: collars 2| are assembled from the opposite end Figure 1 is a fragmentary perspective view of the member, the end collar being held to the illustrating an embodiment of the invention, a. member I2 in any suitable manner. In instances 15 part of this view being shown in section, where the resistance terminals are disposed inter- Figure 2 is an enlarged fragmentary lloingitudimediate the ends of the heating member, the nal sectional view of the embodiment, and collars 2| may of course be assembled from both Figure 8 is a perspective view of one of the ends of the member.

partsv shown in Figures 1 and 2. Referring to Figure 2, the plurality of collars 20 The embodiment of the invention herein dis- 2|, when slid to a predetermined position, are so closed comprises a plurality of heat-conducting arranged that the feathered end 26 of one collar means II, so positioned as to facilitate the transnests within the curved part 2l of the adjacent fer of heat from heat-producing means, such as a collar, thereby providing a sheath substantially heating member I2. covering the heating member I2. The abutment 25 The heating-memberlI2, may be of the electric of the feathered end 26 of one collar with the resistance type shown, and in this particular curved part 2l of an adjacent collar provides instance, comprises a sheet-metal trough, refermeans for spacing the heat-transfer surfaces or ring particularly to Figure 1, having a ilat botfins 28. It will of course be obvious that the 30 tom wall I3, and side walls I4. The trough conspacing depends uponthe width of the surfaces 30 tains refractory material I5,in whichis embedded forming the collar, and in some instances the a suitable electrical resistance, such as`the rewidth of the collars 2| may be less or greater at sistance coils I6 illustrated. In the formation of one portion of the heating element I2 than at a the heating member herein illustrated, the side different portion, thereby providing less or greater walls I4 are first formed as shown in dotted lines heat-transfer at this portion, as the condition 3" at I'I in Figure l, and a plate I8 is disposed in demands. the trough, and overlies the refractory material It will be apparent to those skilled-in the art I5. The ends of the side walls I4 are then bent that I have accomplished at least the principal toward each other, and over the plate I8, as shown object of my invention, and it also will be apparent 40 at I9. It will be obvious that this construction tothose skilled in the art'that the embodiment 40 provides a recess, or longitudinal groove 20, deherein described may be variously changed and ned by the edge margins 0f the side walls Il vmodiiied, without departing from the spirit of and the outwardly disposed portion of the surface the invention, and that the invention is capable of the plate IB. of uses and has advantages not herein specically Each of the heat-conducting means Il comdescribed; hence it will be appreciated that the 45 prises a flange so constructed to provide a collar herein disclosed embodiment is illustrative only, 2 I. The opening of the collar, referring particuand that my invention is not limited thereto. larly to Figure 3, is defined by a bottom surface 22 I claim: and side surfaces 23, corresponding respectively 1 Heating means, comprising; a, hegt-,ing mem- 5G t0 the bO/Om Wall I3 and Side Walls I4 0f the ber, having a recess in its exterior surface; and 50 heating member I2, and by a top surface having a. heat-transfer means, comprising a continuous a depressed portion 24 closely tting the surfaces flange extending about said heating member, havdenng the groove 20. and having also portions ing a portion closely fitting the surfaces denning 25 closely iitting the bent parts I9 of the side Walls said recess, and comprising also a laterally ex- I4 0f the heating member I2. It Will thus be tending heat-transfer 11n, 55

2. Heating means, comprising: an elongated electrical resistance heating element, having an outer metallic casing formed with a longitudinally extending groove; and a heat-transfer means, comprising a homogeneous continuous metallic lcollar closely transversely embracing said casing.

and having a portion closely fitting the surfaces defining said groove, providing heat-transfer contact between substantially the entire inner surface of said collar and the adjacent portion o! said casing; said collar having an integral n extending laterally from one vendl.

3. Heating means, comprising: an elongated electrical resistance heating element oioblong rectangular cross-section, having an outer metallic casing formed with a longitudinally extending groove in one o! the wider faces; and a heat-transfer means, comprising a homogeneous continuous oblong-rectangularly shaped sheetmetal collar closely embracing said casing, and having an inwardly pressed portion in one of the wider faces closely fitting the surfaces dening said groove, providing heat-transfer contact between substantially the entire inner surface of said collar and the adjacent portion of said casing; said collar having an integral fin extending lat-4 erally from one end.

4. Heating means, comprising: an elongatedr electrical resistance heating element of rectangular cross-section, having an outer metallic casing formed with a longitudinally extending groove in one of the faces of said element; a plurality of heat-transfer means, each comprisingahomogeneous continuous rectangularly shaped sheet-metal collar closely transversely embracing said casing, and having an inwardly pressed portion in one of the faces of said collar closely iitting the surfaces deilning said groove, thereby providing heattransfer contact between substantially the entire inner surface of said collar and the adjacent portion of said casing; and each collar having an integral n extending laterally from one end; said collars being separately slidable over an end of said heating element, and along said heating element to predetermined position; the ends of each collar being constructed and 'arranged to intert with ends of adjacent collars, providing a substantially continuous metallic sheath-like covering closely embracing said heating element and having a portion fitting the groove of said heating element, said covering having a plurality of spaced-apart heat-transfer ns.

ALBERT P. WIEGAND. 

